The Clean Fuels Grant Program accelerates the deployment of advanced bus technologies by supporting the use of low-emission vehicles in transit fleets. Purchase or lease of clean fuel buses, the construction or lease of clean fuel electrical recharging facilities, improvement of existing facilities to accommodate clean fuel buses, the re-power of pre-1993 engines with clean fuel technology and the retrofit or rebuild of pre-1993 engines if before a mid-life rebuild. Eligible projects include those relating to: clean fuel, biodiesel, hybrid electric, or zero emissions technology buses that exhibit equivalent or superior emissions reductions to existing clean fuel or hybrid electric technologies.